package org.jeecgframework.core.util;


import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;

	/**
	 * 验证码生成器
	 * 
	 */
	public class SCaptchaUtil {
	    // 图片的宽度。
	    private int width = 120;
	    // 图片的高度。
	    private int height = 40;
	    // 验证码字符个数
	    private int codeCount = 4;
	    // 验证码干扰线数
	    private int lineCount = 50;
	    // 验证码
	    private String code = null;
	    // 验证码图片Buffer
	    private BufferedImage buffImg = null;

	    private char[] codeSequence = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'M', 'N', 'P', 'Q', 'R',
	            'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '2', '3', '4', '5', '6', '7', '8', '9' };
	    // 生成随机数
	    private Random random = new Random();

	    public SCaptchaUtil() {
	        this.createCode();
	    }

	    /**
	     * 
	     * @param width 图片宽
	     * @param height 图片高
	     */
	    public SCaptchaUtil(int width, int height) {
	        this.width = width;
	        this.height = height;
	        this.createCode();
	    }

	    /**
	     * 
	     * @param width 图片宽
	     * @param height 图片高
	     * @param codeCount 字符个数
	     * @param lineCount 干扰线条数
	     */
	    public SCaptchaUtil(int width, int height, int codeCount, int lineCount) {
	        this.width = width;
	        this.height = height;
	        this.codeCount = codeCount;
	        this.lineCount = lineCount;
	        this.createCode();
	    }

	    public void createCode() {
	        int codeX = 0;
	        int fontHeight = 0;
	        fontHeight = height - 5;// 字体的高度
	        codeX = width / (codeCount + 3);// 每个字符的宽度

	        // 图像buffer
	        buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
	        Graphics2D g = buffImg.createGraphics();

	        // 将图像填充为白色
	        g.setColor(Color.WHITE);
	        g.fillRect(0, 0, width, height);

	        // 创建字体
	        ImgFontByte imgFont = new ImgFontByte();
	        Font font = imgFont.getFont(fontHeight);
	        g.setFont(font);

	        StringBuffer randomCode = new StringBuffer();
	        // 随机产生验证码字符
	        for (int i = 0; i < codeCount; i++) {
	            String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);
	            // 设置字体颜色
	            g.setColor(getRandomColor());
	            // 设置字体位置
	            g.drawString(strRand, (i + 1) * codeX, getRandomNumber(height / 2) + 25);
	            randomCode.append(strRand);
	        }
	        code = randomCode.toString();
	    }

	    /** 获取随机颜色 */
	    private Color getRandomColor() {
	        int r = getRandomNumber(255);
	        int g = getRandomNumber(255);
	        int b = getRandomNumber(255);
	        return new Color(r, g, b);
	    }

	    /** 获取随机数 */
	    private int getRandomNumber(int number) {
	        return random.nextInt(number);
	    }

	    public void write(String path) throws IOException {
	        OutputStream sos = new FileOutputStream(path);
	        this.write(sos);
	    }

	    public void write(OutputStream sos) throws IOException {
	        ImageIO.write(buffImg, "png", sos);
	        sos.close();
	    }

	    public BufferedImage getBuffImg() {
	        return buffImg;
	    }

	    public String getCode() {
	        return code;
	    }

	    /** 字体样式类 */
	    class ImgFontByte {
	        public Font getFont(int fontHeight) {
	            try {
	                Font baseFont = Font.createFont(Font.HANGING_BASELINE, new ByteArrayInputStream(
	                        hex2byte(getFontByteStr())));
	                return baseFont.deriveFont(Font.PLAIN, fontHeight);
	            } catch (Exception e) {
	                return new Font("Arial", Font.PLAIN, fontHeight);
	            }
	        }

	        private byte[] hex2byte(String str) {
	            if (str == null)
	                return null;
	            str = str.trim();
	            int len = str.length();
	            if (len == 0 || len % 2 == 1)
	                return null;

	            byte[] b = new byte[len / 2];
	            try {
	                for (int i = 0; i < str.length(); i += 2) {
	                    b[i / 2] = (byte) Integer.decode("0x" + str.substring(i, i + 2)).intValue();
	                }
	                return b;
	            } catch (Exception e) {
	                return null;
	            }
	        }

	        // 字体文件的十六进制字符串
	        private String getFontByteStr() {
	            //防止报字符串长度过长错误，改为从配置文件读取
	            return ReadFontByteProperties.getFontByteStr();
	        }
	    }

}
